Phone numbers in Columbia, Louisiana
Columbia has 4 phone prefixes in area code 318.
Biggest holders: AT&T Mobility, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 75%
- Local phone company 25%
Every prefix in Columbia
Search the first six digits of a number in this list. If it's here, the number started in Columbia with the carrier shown. If it isn't, check the Louisiana page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 318-502 | AT&T Mobility | Mobile carrier | 2003 |
| 318-594 | AT&T Mobility | Mobile carrier | 2009 |
| 318-649 | AT&T (local phone) | Local phone company | – |
| 318-764 | AT&T Mobility | Mobile carrier | 2021 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.